河南省西部山区降水特征分析

Analysis of Characteristics of Precipitation in the Western Mountainous Area in Henan Province

摘要: 利用河南省西部山区28个站点2014~2016年逐时降水资料，对西部山区降水日变化及不同降水等级和降水历时的时空演变规律进行了分析，研究发现，降水量、降水频次与降水强度日变化显著，其中降水强度对降水量的贡献最大；西部山区各个降水历时的降水贡献率随降水历时的逐渐增大呈现先略有减少后增加的一个线性增加趋势，而降水发生率则呈明显的幂指数型减小趋势；西部山区各个降水等级的降水贡献率和降水发生率随降水等级的逐渐增大均呈幂指数递减的趋势，且小雨发生频率最高；此外，统计分析表明河南西部山区降水量与纬度呈显著负相关关系。

Abstract: Based on the time-lapse precipitation data from 28 stations in the western mountainous area of Henan Province from 2014 to 2016, the daily variation of precipitation in the western mountainous areas and the temporal and spatial evolution of different precipitation levels and precipitation durations were analyzed. The study found that the daily change of precipitation, precipitation frequency and precipitation intensity is significant, in which the precipitation intensity contributes the most to the precipitation; the precipitation contribution rate of each precipitation in the western mountainous area shows a linear increase trend with a slight decrease after the precipi-tation duration, while the precipitation incidence is obvious. The power exponential type shows a decrease trend; the precipitation contribution rate and precipitation rate of each precipitation level in the western mountainous areas show a trend of decreasing power index with the gradual increase of precipitation level, and the frequency of light rain is the highest; in addition, statistical analysis shows for precipitation in the mountainous area of western Henan, there is a significant negative correlation between quantity and latitude.